diff --git a/src/html/api/entry.php b/src/html/api/entry.php
index e748741..95ef2cf 100644
--- a/src/html/api/entry.php
+++ b/src/html/api/entry.php
@@ -38,7 +38,7 @@ class EntryAPI extends RestAPI {
         if($entry['id'] != null) {
             $statement=$connection->prepare("update entry set value_date=:value_date, operation_date=:operation_date, label=:label, value=:value, account_id=:account, category=:category where id=:id");
         } else {
-            $statement=$connection->prepare("insert into entry (value_date, operation_date, label, value, account_id) values (:value_date, :operation_date, :label, :value, :account, :category)");
+            $statement=$connection->prepare("insert into entry (value_date, operation_date, label, value, account_id, category) values (:value_date, :operation_date, :label, :value, :account, :category)");
         }
 
         $statement->bindParam("value_date", $entry['value_date']);
diff --git a/src/html/index.html b/src/html/index.html
index 13b9701..3f6af1d 100644
--- a/src/html/index.html
+++ b/src/html/index.html
@@ -41,7 +41,7 @@
             </div>
 
             <div class="span4">
-              <div id="categories-chart-placeholder" data-bind="pieChart: $root.categoriesChart"></div>
+              <div id="expense-categories-chart-placeholder" data-bind="pieChart: $root.expenseCategoriesChart"></div>
             </div>
           </div>
 
diff --git a/src/html/js/entries.js b/src/html/js/entries.js
index 70c3019..08b3cac 100644
--- a/src/html/js/entries.js
+++ b/src/html/js/entries.js
@@ -1,23 +1,13 @@
 function entry(data){
-    var id = ko.utils.unwrapObservable(data.id);
-    var value_date = ko.utils.unwrapObservable(data.value_date);
-    var operation_date = ko.utils.unwrapObservable(data.operation_date);
-    var label = ko.utils.unwrapObservable(data.label);
-    var value = ko.utils.unwrapObservable(data.value);
-    var account = ko.utils.unwrapObservable(data.account);
-    var sold = ko.utils.unwrapObservable(data.sold);
-    var pointedSold = ko.utils.unwrapObservable(data.pointedSold);
-    var category = ko.utils.unwrapObservable(data.category);
-
-    this.id=ko.observable(id ? id : null);
-    this.value_date=ko.observable(value_date ? value_date : null);
-    this.operation_date=ko.observable(operation_date ? operation_date : null);
-    this.label=ko.observable(label ? label : null);
-    this.value=ko.observable(value ? value : null);
-    this.account=ko.observable(account ? account : null);
-    this.sold=ko.observable(sold ? sold : null);
-    this.pointedSold=ko.observable(pointedSold ? pointedSold : null);
-    this.category=ko.observable(category ? category : null);
+    this.id=ko.observable(ko.utils.unwrapObservable(data.id));
+    this.value_date=ko.observable(ko.utils.unwrapObservable(data.value_date));
+    this.operation_date=ko.observable(ko.utils.unwrapObservable(data.operation_date));
+    this.label=ko.observable(ko.utils.unwrapObservable(data.label));
+    this.value=ko.observable(ko.utils.unwrapObservable(data.value));
+    this.account=ko.observable(ko.utils.unwrapObservable(data.account));
+    this.sold=ko.observable(ko.utils.unwrapObservable(data.sold));
+    this.pointedSold=ko.observable(ko.utils.unwrapObservable(data.pointedSold));
+    this.category=ko.observable(ko.utils.unwrapObservable(data.category));
 }
 
 function message(alertType, title, message) {
@@ -41,7 +31,7 @@ var ListViewModel = function() {
     self.itemToRemove = ko.observable();
     self.chart = null;
 
-    self.categoriesChart = ko.computed(function() {
+    self.expenseCategoriesChart = ko.computed(function() {
       var entries=ko.utils.unwrapObservable(self.entries);
 
       var chartValues = [];
@@ -258,13 +248,14 @@ var ListViewModel = function() {
     };
 
     self.save = function() {
-      var item = new entry(self.selectedItem());
+      var item = ko.toJS(self.selectedItem());
 
-      if(item.value_date()) {
-          item.value_date(dateToString(item.value_date()));
+      if(item.value_date) {
+          item.value_date = dateToString(item.value_date);
       }
-      if(item.operation_date()) {
-          item.operation_date(dateToString(item.operation_date()));
+
+      if(item.operation_date) {
+          item.operation_date = dateToString(item.operation_date);
       }
 
       $.post("api/entry.php", {action: "save_entry", entry:item}).success(function(data) {
@@ -403,6 +394,7 @@ drawChart = function(entries, element) {
 
     // plot chart
     window.chart = $.jqplot(element.id, chartValues, {
+        title: "&Eacute;volution du solde",
         axes:{
           xaxis:{
             renderer:$.jqplot.DateAxisRenderer,
@@ -446,6 +438,7 @@ drawPieChart = function(entries, element) {
 
     // plot chart
     window.pieChart = $.jqplot(element.id, chartValues, {
+        title: "D&eacute;penses",
         seriesDefaults: {
           renderer: $.jqplot.PieRenderer,
           rendererOptions: {